[linux.git] / net / core / gen_stats.c

/*
 * net/core/gen_stats.c
 *
 *             This program is free software; you can redistribute it and/or
 *             modify it under the terms of the GNU General Public License
 *             as published by the Free Software Foundation; either version
 *             2 of the License, or (at your option) any later version.
 *
 * Authors:  Thomas Graf <[email protected]>
 *           Jamal Hadi Salim
 *           Alexey Kuznetsov, <[email protected]>
 *
 * See Documentation/networking/gen_stats.txt
 */

#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/interrupt.h>
#include <linux/socket.h>
#include <linux/rtnetlink.h>
#include <linux/gen_stats.h>
#include <net/netlink.h>
#include <net/gen_stats.h>


static inline int
gnet_stats_copy(struct gnet_dump *d, int type, void *buf, int size, int padattr)
{
	if (nla_put_64bit(d->skb, type, size, buf, padattr))
		goto nla_put_failure;
	return 0;

nla_put_failure:
	if (d->lock)
		spin_unlock_bh(d->lock);
	kfree(d->xstats);
	d->xstats = NULL;
	d->xstats_len = 0;
	return -1;
}

/**
 * gnet_stats_start_copy_compat - start dumping procedure in compatibility mode
 * @skb: socket buffer to put statistics TLVs into
 * @type: TLV type for top level statistic TLV
 * @tc_stats_type: TLV type for backward compatibility struct tc_stats TLV
 * @xstats_type: TLV type for backward compatibility xstats TLV
 * @lock: statistics lock
 * @d: dumping handle
 * @padattr: padding attribute
 *
 * Initializes the dumping handle, grabs the statistic lock and appends
 * an empty TLV header to the socket buffer for use a container for all
 * other statistic TLVS.
 *
 * The dumping handle is marked to be in backward compatibility mode telling
 * all gnet_stats_copy_XXX() functions to fill a local copy of struct tc_stats.
 *
 * Returns 0 on success or -1 if the room in the socket buffer was not sufficient.
 */
int
gnet_stats_start_copy_compat(struct sk_buff *skb, int type, int tc_stats_type,
			     int xstats_type, spinlock_t *lock,
			     struct gnet_dump *d, int padattr)
	__acquires(lock)
{
	memset(d, 0, sizeof(*d));

	if (type)
		d->tail = (struct nlattr *)skb_tail_pointer(skb);
	d->skb = skb;
	d->compat_tc_stats = tc_stats_type;
	d->compat_xstats = xstats_type;
	d->padattr = padattr;
	if (lock) {
		d->lock = lock;
		spin_lock_bh(lock);
	}
	if (d->tail) {
		int ret = gnet_stats_copy(d, type, NULL, 0, padattr);

		/* The initial attribute added in gnet_stats_copy() may be
		 * preceded by a padding attribute, in which case d->tail will
		 * end up pointing at the padding instead of the real attribute.
		 * Fix this so gnet_stats_finish_copy() adjusts the length of
		 * the right attribute.
		 */
		if (ret == 0 && d->tail->nla_type == padattr)
			d->tail = (struct nlattr *)((char *)d->tail +
						    NLA_ALIGN(d->tail->nla_len));
		return ret;
	}

	return 0;
}
EXPORT_SYMBOL(gnet_stats_start_copy_compat);

/**
 * gnet_stats_start_copy - start dumping procedure in compatibility mode
 * @skb: socket buffer to put statistics TLVs into
 * @type: TLV type for top level statistic TLV
 * @lock: statistics lock
 * @d: dumping handle
 * @padattr: padding attribute
 *
 * Initializes the dumping handle, grabs the statistic lock and appends
 * an empty TLV header to the socket buffer for use a container for all
 * other statistic TLVS.
 *
 * Returns 0 on success or -1 if the room in the socket buffer was not sufficient.
 */
int
gnet_stats_start_copy(struct sk_buff *skb, int type, spinlock_t *lock,
		      struct gnet_dump *d, int padattr)
{
	return gnet_stats_start_copy_compat(skb, type, 0, 0, lock, d, padattr);
}
EXPORT_SYMBOL(gnet_stats_start_copy);

static void
__gnet_stats_copy_basic_cpu(struct gnet_stats_basic_packed *bstats,
			    struct gnet_stats_basic_cpu __percpu *cpu)
{
	int i;

	for_each_possible_cpu(i) {
		struct gnet_stats_basic_cpu *bcpu = per_cpu_ptr(cpu, i);
		unsigned int start;
		u64 bytes;
		u32 packets;

		do {
			start = u64_stats_fetch_begin_irq(&bcpu->syncp);
			bytes = bcpu->bstats.bytes;
			packets = bcpu->bstats.packets;
		} while (u64_stats_fetch_retry_irq(&bcpu->syncp, start));

		bstats->bytes += bytes;
		bstats->packets += packets;
	}
}

void
__gnet_stats_copy_basic(const seqcount_t *running,
			struct gnet_stats_basic_packed *bstats,
			struct gnet_stats_basic_cpu __percpu *cpu,
			struct gnet_stats_basic_packed *b)
{
	unsigned int seq;

	if (cpu) {
		__gnet_stats_copy_basic_cpu(bstats, cpu);
		return;
	}
	do {
		if (running)
			seq = read_seqcount_begin(running);
		bstats->bytes = b->bytes;
		bstats->packets = b->packets;
	} while (running && read_seqcount_retry(running, seq));
}
EXPORT_SYMBOL(__gnet_stats_copy_basic);

static int
___gnet_stats_copy_basic(const seqcount_t *running,
			 struct gnet_dump *d,
			 struct gnet_stats_basic_cpu __percpu *cpu,
			 struct gnet_stats_basic_packed *b,
			 int type)
{
	struct gnet_stats_basic_packed bstats = {0};

	__gnet_stats_copy_basic(running, &bstats, cpu, b);

	if (d->compat_tc_stats && type == TCA_STATS_BASIC) {
		d->tc_stats.bytes = bstats.bytes;
		d->tc_stats.packets = bstats.packets;
	}

	if (d->tail) {
		struct gnet_stats_basic sb;

		memset(&sb, 0, sizeof(sb));
		sb.bytes = bstats.bytes;
		sb.packets = bstats.packets;
		return gnet_stats_copy(d, type, &sb, sizeof(sb),
				       TCA_STATS_PAD);
	}
	return 0;
}

/**
 * gnet_stats_copy_basic - copy basic statistics into statistic TLV
 * @running: seqcount_t pointer
 * @d: dumping handle
 * @cpu: copy statistic per cpu
 * @b: basic statistics
 *
 * Appends the basic statistics to the top level TLV created by
 * gnet_stats_start_copy().
 *
 * Returns 0 on success or -1 with the statistic lock released
 * if the room in the socket buffer was not sufficient.
 */
int
gnet_stats_copy_basic(const seqcount_t *running,
		      struct gnet_dump *d,
		      struct gnet_stats_basic_cpu __percpu *cpu,
		      struct gnet_stats_basic_packed *b)
{
	return ___gnet_stats_copy_basic(running, d, cpu, b,
					TCA_STATS_BASIC);
}
EXPORT_SYMBOL(gnet_stats_copy_basic);

/**
 * gnet_stats_copy_basic_hw - copy basic hw statistics into statistic TLV
 * @running: seqcount_t pointer
 * @d: dumping handle
 * @cpu: copy statistic per cpu
 * @b: basic statistics
 *
 * Appends the basic statistics to the top level TLV created by
 * gnet_stats_start_copy().
 *
 * Returns 0 on success or -1 with the statistic lock released
 * if the room in the socket buffer was not sufficient.
 */
int
gnet_stats_copy_basic_hw(const seqcount_t *running,
			 struct gnet_dump *d,
			 struct gnet_stats_basic_cpu __percpu *cpu,
			 struct gnet_stats_basic_packed *b)
{
	return ___gnet_stats_copy_basic(running, d, cpu, b,
					TCA_STATS_BASIC_HW);
}
EXPORT_SYMBOL(gnet_stats_copy_basic_hw);

/**
 * gnet_stats_copy_rate_est - copy rate estimator statistics into statistics TLV
 * @d: dumping handle
 * @rate_est: rate estimator
 *
 * Appends the rate estimator statistics to the top level TLV created by
 * gnet_stats_start_copy().
 *
 * Returns 0 on success or -1 with the statistic lock released
 * if the room in the socket buffer was not sufficient.
 */
int
gnet_stats_copy_rate_est(struct gnet_dump *d,
			 struct net_rate_estimator __rcu **rate_est)
{
	struct gnet_stats_rate_est64 sample;
	struct gnet_stats_rate_est est;
	int res;

	if (!gen_estimator_read(rate_est, &sample))
		return 0;
	est.bps = min_t(u64, UINT_MAX, sample.bps);
	/* we have some time before reaching 2^32 packets per second */
	est.pps = sample.pps;

	if (d->compat_tc_stats) {
		d->tc_stats.bps = est.bps;
		d->tc_stats.pps = est.pps;
	}

	if (d->tail) {
		res = gnet_stats_copy(d, TCA_STATS_RATE_EST, &est, sizeof(est),
				      TCA_STATS_PAD);
		if (res < 0 || est.bps == sample.bps)
			return res;
		/* emit 64bit stats only if needed */
		return gnet_stats_copy(d, TCA_STATS_RATE_EST64, &sample,
				       sizeof(sample), TCA_STATS_PAD);
	}

	return 0;
}
EXPORT_SYMBOL(gnet_stats_copy_rate_est);

static void
__gnet_stats_copy_queue_cpu(struct gnet_stats_queue *qstats,
			    const struct gnet_stats_queue __percpu *q)
{
	int i;

	for_each_possible_cpu(i) {
		const struct gnet_stats_queue *qcpu = per_cpu_ptr(q, i);

		qstats->qlen = 0;
		qstats->backlog += qcpu->backlog;
		qstats->drops += qcpu->drops;
		qstats->requeues += qcpu->requeues;
		qstats->overlimits += qcpu->overlimits;
	}
}

void __gnet_stats_copy_queue(struct gnet_stats_queue *qstats,
			     const struct gnet_stats_queue __percpu *cpu,
			     const struct gnet_stats_queue *q,
			     __u32 qlen)
{
	if (cpu) {
		__gnet_stats_copy_queue_cpu(qstats, cpu);
	} else {
		qstats->qlen = q->qlen;
		qstats->backlog = q->backlog;
		qstats->drops = q->drops;
		qstats->requeues = q->requeues;
		qstats->overlimits = q->overlimits;
	}

	qstats->qlen = qlen;
}
EXPORT_SYMBOL(__gnet_stats_copy_queue);

/**
 * gnet_stats_copy_queue - copy queue statistics into statistics TLV
 * @d: dumping handle
 * @cpu_q: per cpu queue statistics
 * @q: queue statistics
 * @qlen: queue length statistics
 *
 * Appends the queue statistics to the top level TLV created by
 * gnet_stats_start_copy(). Using per cpu queue statistics if
 * they are available.
 *
 * Returns 0 on success or -1 with the statistic lock released
 * if the room in the socket buffer was not sufficient.
 */
int
gnet_stats_copy_queue(struct gnet_dump *d,
		      struct gnet_stats_queue __percpu *cpu_q,
		      struct gnet_stats_queue *q, __u32 qlen)
{
	struct gnet_stats_queue qstats = {0};

	__gnet_stats_copy_queue(&qstats, cpu_q, q, qlen);

	if (d->compat_tc_stats) {
		d->tc_stats.drops = qstats.drops;
		d->tc_stats.qlen = qstats.qlen;
		d->tc_stats.backlog = qstats.backlog;
		d->tc_stats.overlimits = qstats.overlimits;
	}

	if (d->tail)
		return gnet_stats_copy(d, TCA_STATS_QUEUE,
				       &qstats, sizeof(qstats),
				       TCA_STATS_PAD);

	return 0;
}
EXPORT_SYMBOL(gnet_stats_copy_queue);

/**
 * gnet_stats_copy_app - copy application specific statistics into statistics TLV
 * @d: dumping handle
 * @st: application specific statistics data
 * @len: length of data
 *
 * Appends the application specific statistics to the top level TLV created by
 * gnet_stats_start_copy() and remembers the data for XSTATS if the dumping
 * handle is in backward compatibility mode.
 *
 * Returns 0 on success or -1 with the statistic lock released
 * if the room in the socket buffer was not sufficient.
 */
int
gnet_stats_copy_app(struct gnet_dump *d, void *st, int len)
{
	if (d->compat_xstats) {
		d->xstats = kmemdup(st, len, GFP_ATOMIC);
		if (!d->xstats)
			goto err_out;
		d->xstats_len = len;
	}

	if (d->tail)
		return gnet_stats_copy(d, TCA_STATS_APP, st, len,
				       TCA_STATS_PAD);

	return 0;

err_out:
	if (d->lock)
		spin_unlock_bh(d->lock);
	d->xstats_len = 0;
	return -1;
}
EXPORT_SYMBOL(gnet_stats_copy_app);

/**
 * gnet_stats_finish_copy - finish dumping procedure
 * @d: dumping handle
 *
 * Corrects the length of the top level TLV to include all TLVs added
 * by gnet_stats_copy_XXX() calls. Adds the backward compatibility TLVs
 * if gnet_stats_start_copy_compat() was used and releases the statistics
 * lock.
 *
 * Returns 0 on success or -1 with the statistic lock released
 * if the room in the socket buffer was not sufficient.
 */
int
gnet_stats_finish_copy(struct gnet_dump *d)
{
	if (d->tail)
		d->tail->nla_len = skb_tail_pointer(d->skb) - (u8 *)d->tail;

	if (d->compat_tc_stats)
		if (gnet_stats_copy(d, d->compat_tc_stats, &d->tc_stats,
				    sizeof(d->tc_stats), d->padattr) < 0)
			return -1;

	if (d->compat_xstats && d->xstats) {
		if (gnet_stats_copy(d, d->compat_xstats, d->xstats,
				    d->xstats_len, d->padattr) < 0)
			return -1;
	}

	if (d->lock)
		spin_unlock_bh(d->lock);
	kfree(d->xstats);
	d->xstats = NULL;
	d->xstats_len = 0;
	return 0;
}
EXPORT_SYMBOL(gnet_stats_finish_copy);
Commit	Line	Data
1da177e4 LT	1	/*
	2	* net/core/gen_stats.c
	3	*
	4	* This program is free software; you can redistribute it and/or
	5	* modify it under the terms of the GNU General Public License
	6	* as published by the Free Software Foundation; either version
	7	* 2 of the License, or (at your option) any later version.
	8	*
	9	* Authors: Thomas Graf <[email protected]>
	10	* Jamal Hadi Salim
	11	* Alexey Kuznetsov, <[email protected]>
	12	*
	13	* See Documentation/networking/gen_stats.txt
	14	*/
	15
	16	#include <linux/types.h>
	17	#include <linux/kernel.h>
	18	#include <linux/module.h>
	19	#include <linux/interrupt.h>
	20	#include <linux/socket.h>
	21	#include <linux/rtnetlink.h>
	22	#include <linux/gen_stats.h>
1e90474c	23	#include <net/netlink.h>
1da177e4 LT	24	#include <net/gen_stats.h>
	25
	26
	27	static inline int
9854518e	28	gnet_stats_copy(struct gnet_dump d, int type, void buf, int size, int padattr)
1da177e4	29	{
9854518e	30	if (nla_put_64bit(d->skb, type, size, buf, padattr))
14ad6647	31	goto nla_put_failure;
1da177e4 LT	32	return 0;
1da177e4 LT	33
1e90474c	34	nla_put_failure:
edb09eb1 ED	35	if (d->lock)
edb09eb1 ED	36	spin_unlock_bh(d->lock);
1c4cff0c IG	37	kfree(d->xstats);
	38	d->xstats = NULL;
	39	d->xstats_len = 0;
1da177e4 LT	40	return -1;
	41	}
	42
	43	/**
	44	* gnet_stats_start_copy_compat - start dumping procedure in compatibility mode
	45	* @skb: socket buffer to put statistics TLVs into
	46	* @type: TLV type for top level statistic TLV
	47	* @tc_stats_type: TLV type for backward compatibility struct tc_stats TLV
	48	* @xstats_type: TLV type for backward compatibility xstats TLV
	49	* @lock: statistics lock
	50	* @d: dumping handle
e0d194ad	51	* @padattr: padding attribute
1da177e4 LT	52	*
	53	* Initializes the dumping handle, grabs the statistic lock and appends
	54	* an empty TLV header to the socket buffer for use a container for all
	55	* other statistic TLVS.
	56	*
	57	* The dumping handle is marked to be in backward compatibility mode telling
	58	* all gnet_stats_copy_XXX() functions to fill a local copy of struct tc_stats.
	59	*
	60	* Returns 0 on success or -1 if the room in the socket buffer was not sufficient.
	61	*/
	62	int
	63	gnet_stats_start_copy_compat(struct sk_buff *skb, int type, int tc_stats_type,
9854518e ND	64	int xstats_type, spinlock_t *lock,
9854518e ND	65	struct gnet_dump *d, int padattr)
9a429c49	66	__acquires(lock)
1da177e4 LT	67	{
1da177e4 LT	68	memset(d, 0, sizeof(*d));
4ec93edb	69
1da177e4	70	if (type)
1e90474c	71	d->tail = (struct nlattr *)skb_tail_pointer(skb);
1da177e4 LT	72	d->skb = skb;
	73	d->compat_tc_stats = tc_stats_type;
	74	d->compat_xstats = xstats_type;
9854518e	75	d->padattr = padattr;
edb09eb1 ED	76	if (lock) {
	77	d->lock = lock;
	78	spin_lock_bh(lock);
	79	}
d5a672ac THJ	80	if (d->tail) {
	81	int ret = gnet_stats_copy(d, type, NULL, 0, padattr);
	82
	83	/* The initial attribute added in gnet_stats_copy() may be
	84	* preceded by a padding attribute, in which case d->tail will
	85	* end up pointing at the padding instead of the real attribute.
	86	* Fix this so gnet_stats_finish_copy() adjusts the length of
	87	* the right attribute.
	88	*/
	89	if (ret == 0 && d->tail->nla_type == padattr)
	90	d->tail = (struct nlattr )((char )d->tail +
	91	NLA_ALIGN(d->tail->nla_len));
	92	return ret;
	93	}
1da177e4 LT	94
	95	return 0;
	96	}
9e34a5b5	97	EXPORT_SYMBOL(gnet_stats_start_copy_compat);
1da177e4 LT	98
1da177e4 LT	99	/**
9854518e	100	* gnet_stats_start_copy - start dumping procedure in compatibility mode
1da177e4 LT	101	* @skb: socket buffer to put statistics TLVs into
	102	* @type: TLV type for top level statistic TLV
	103	* @lock: statistics lock
	104	* @d: dumping handle
e0d194ad	105	* @padattr: padding attribute
1da177e4 LT	106	*
	107	* Initializes the dumping handle, grabs the statistic lock and appends
	108	* an empty TLV header to the socket buffer for use a container for all
	109	* other statistic TLVS.
	110	*
	111	* Returns 0 on success or -1 if the room in the socket buffer was not sufficient.
	112	*/
	113	int
	114	gnet_stats_start_copy(struct sk_buff skb, int type, spinlock_t lock,
9854518e	115	struct gnet_dump *d, int padattr)
1da177e4	116	{
9854518e	117	return gnet_stats_start_copy_compat(skb, type, 0, 0, lock, d, padattr);
1da177e4	118	}
9e34a5b5	119	EXPORT_SYMBOL(gnet_stats_start_copy);
1da177e4	120
22e0f8b9 JF	121	static void
	122	__gnet_stats_copy_basic_cpu(struct gnet_stats_basic_packed *bstats,
	123	struct gnet_stats_basic_cpu __percpu *cpu)
	124	{
	125	int i;
	126
	127	for_each_possible_cpu(i) {
	128	struct gnet_stats_basic_cpu *bcpu = per_cpu_ptr(cpu, i);
	129	unsigned int start;
02c0fc1b WC	130	u64 bytes;
02c0fc1b WC	131	u32 packets;
22e0f8b9 JF	132
	133	do {
	134	start = u64_stats_fetch_begin_irq(&bcpu->syncp);
	135	bytes = bcpu->bstats.bytes;
	136	packets = bcpu->bstats.packets;
	137	} while (u64_stats_fetch_retry_irq(&bcpu->syncp, start));
	138
02c0fc1b WC	139	bstats->bytes += bytes;
02c0fc1b WC	140	bstats->packets += packets;
22e0f8b9 JF	141	}
	142	}
	143
	144	void
edb09eb1 ED	145	__gnet_stats_copy_basic(const seqcount_t *running,
edb09eb1 ED	146	struct gnet_stats_basic_packed *bstats,
22e0f8b9 JF	147	struct gnet_stats_basic_cpu __percpu *cpu,
	148	struct gnet_stats_basic_packed *b)
	149	{
edb09eb1 ED	150	unsigned int seq;
edb09eb1 ED	151
22e0f8b9 JF	152	if (cpu) {
22e0f8b9 JF	153	__gnet_stats_copy_basic_cpu(bstats, cpu);
edb09eb1 ED	154	return;
	155	}
	156	do {
	157	if (running)
	158	seq = read_seqcount_begin(running);
22e0f8b9 JF	159	bstats->bytes = b->bytes;
22e0f8b9 JF	160	bstats->packets = b->packets;
edb09eb1	161	} while (running && read_seqcount_retry(running, seq));
22e0f8b9 JF	162	}
	163	EXPORT_SYMBOL(__gnet_stats_copy_basic);
	164
5d70a670	165	static int
5e111210 EC	166	___gnet_stats_copy_basic(const seqcount_t *running,
	167	struct gnet_dump *d,
	168	struct gnet_stats_basic_cpu __percpu *cpu,
	169	struct gnet_stats_basic_packed *b,
	170	int type)
1da177e4	171	{
22e0f8b9 JF	172	struct gnet_stats_basic_packed bstats = {0};
22e0f8b9 JF	173
edb09eb1	174	__gnet_stats_copy_basic(running, &bstats, cpu, b);
22e0f8b9	175
5e111210	176	if (d->compat_tc_stats && type == TCA_STATS_BASIC) {
22e0f8b9 JF	177	d->tc_stats.bytes = bstats.bytes;
22e0f8b9 JF	178	d->tc_stats.packets = bstats.packets;
1da177e4 LT	179	}
1da177e4 LT	180
c1a8f1f1 ED	181	if (d->tail) {
c1a8f1f1 ED	182	struct gnet_stats_basic sb;
1da177e4	183
c1a8f1f1	184	memset(&sb, 0, sizeof(sb));
22e0f8b9 JF	185	sb.bytes = bstats.bytes;
22e0f8b9 JF	186	sb.packets = bstats.packets;
5e111210	187	return gnet_stats_copy(d, type, &sb, sizeof(sb),
9854518e	188	TCA_STATS_PAD);
c1a8f1f1	189	}
1da177e4 LT	190	return 0;
1da177e4 LT	191	}
5e111210 EC	192
	193	/**
	194	* gnet_stats_copy_basic - copy basic statistics into statistic TLV
	195	* @running: seqcount_t pointer
	196	* @d: dumping handle
	197	* @cpu: copy statistic per cpu
	198	* @b: basic statistics
	199	*
	200	* Appends the basic statistics to the top level TLV created by
	201	* gnet_stats_start_copy().
	202	*
	203	* Returns 0 on success or -1 with the statistic lock released
	204	* if the room in the socket buffer was not sufficient.
	205	*/
	206	int
	207	gnet_stats_copy_basic(const seqcount_t *running,
	208	struct gnet_dump *d,
	209	struct gnet_stats_basic_cpu __percpu *cpu,
	210	struct gnet_stats_basic_packed *b)
	211	{
	212	return ___gnet_stats_copy_basic(running, d, cpu, b,
	213	TCA_STATS_BASIC);
	214	}
9e34a5b5	215	EXPORT_SYMBOL(gnet_stats_copy_basic);
1da177e4	216
5e111210 EC	217	/**
	218	* gnet_stats_copy_basic_hw - copy basic hw statistics into statistic TLV
	219	* @running: seqcount_t pointer
	220	* @d: dumping handle
	221	* @cpu: copy statistic per cpu
	222	* @b: basic statistics
	223	*
	224	* Appends the basic statistics to the top level TLV created by
	225	* gnet_stats_start_copy().
	226	*
	227	* Returns 0 on success or -1 with the statistic lock released
	228	* if the room in the socket buffer was not sufficient.
	229	*/
	230	int
	231	gnet_stats_copy_basic_hw(const seqcount_t *running,
	232	struct gnet_dump *d,
	233	struct gnet_stats_basic_cpu __percpu *cpu,
	234	struct gnet_stats_basic_packed *b)
	235	{
	236	return ___gnet_stats_copy_basic(running, d, cpu, b,
	237	TCA_STATS_BASIC_HW);
	238	}
	239	EXPORT_SYMBOL(gnet_stats_copy_basic_hw);
	240
1da177e4 LT	241	/**
	242	* gnet_stats_copy_rate_est - copy rate estimator statistics into statistics TLV
	243	* @d: dumping handle
1c0d32fd	244	* @rate_est: rate estimator
1da177e4 LT	245	*
	246	* Appends the rate estimator statistics to the top level TLV created by
	247	* gnet_stats_start_copy().
	248	*
	249	* Returns 0 on success or -1 with the statistic lock released
	250	* if the room in the socket buffer was not sufficient.
	251	*/
	252	int
d250a5f9	253	gnet_stats_copy_rate_est(struct gnet_dump *d,
1c0d32fd	254	struct net_rate_estimator __rcu **rate_est)
1da177e4	255	{
1c0d32fd	256	struct gnet_stats_rate_est64 sample;
45203a3b ED	257	struct gnet_stats_rate_est est;
	258	int res;
	259
1c0d32fd	260	if (!gen_estimator_read(rate_est, &sample))
d250a5f9	261	return 0;
1c0d32fd	262	est.bps = min_t(u64, UINT_MAX, sample.bps);
45203a3b	263	/* we have some time before reaching 2^32 packets per second */
1c0d32fd	264	est.pps = sample.pps;
45203a3b	265
1da177e4	266	if (d->compat_tc_stats) {
45203a3b ED	267	d->tc_stats.bps = est.bps;
45203a3b ED	268	d->tc_stats.pps = est.pps;
1da177e4 LT	269	}
1da177e4 LT	270
45203a3b	271	if (d->tail) {
9854518e ND	272	res = gnet_stats_copy(d, TCA_STATS_RATE_EST, &est, sizeof(est),
9854518e ND	273	TCA_STATS_PAD);
1c0d32fd	274	if (res < 0 \|\| est.bps == sample.bps)
45203a3b ED	275	return res;
45203a3b ED	276	/* emit 64bit stats only if needed */
1c0d32fd ED	277	return gnet_stats_copy(d, TCA_STATS_RATE_EST64, &sample,
1c0d32fd ED	278	sizeof(sample), TCA_STATS_PAD);
45203a3b	279	}
1da177e4 LT	280
	281	return 0;
	282	}
9e34a5b5	283	EXPORT_SYMBOL(gnet_stats_copy_rate_est);
1da177e4	284
b0ab6f92 JF	285	static void
	286	__gnet_stats_copy_queue_cpu(struct gnet_stats_queue *qstats,
	287	const struct gnet_stats_queue __percpu *q)
	288	{
	289	int i;
	290
	291	for_each_possible_cpu(i) {
	292	const struct gnet_stats_queue *qcpu = per_cpu_ptr(q, i);
	293
	294	qstats->qlen = 0;
	295	qstats->backlog += qcpu->backlog;
	296	qstats->drops += qcpu->drops;
	297	qstats->requeues += qcpu->requeues;
	298	qstats->overlimits += qcpu->overlimits;
	299	}
	300	}
	301
b01ac095 JF	302	void __gnet_stats_copy_queue(struct gnet_stats_queue *qstats,
	303	const struct gnet_stats_queue __percpu *cpu,
	304	const struct gnet_stats_queue *q,
	305	__u32 qlen)
b0ab6f92 JF	306	{
	307	if (cpu) {
	308	__gnet_stats_copy_queue_cpu(qstats, cpu);
	309	} else {
	310	qstats->qlen = q->qlen;
	311	qstats->backlog = q->backlog;
	312	qstats->drops = q->drops;
	313	qstats->requeues = q->requeues;
	314	qstats->overlimits = q->overlimits;
	315	}
	316
	317	qstats->qlen = qlen;
	318	}
b01ac095	319	EXPORT_SYMBOL(__gnet_stats_copy_queue);
b0ab6f92	320
1da177e4 LT	321	/**
	322	* gnet_stats_copy_queue - copy queue statistics into statistics TLV
	323	* @d: dumping handle
b0ab6f92	324	* @cpu_q: per cpu queue statistics
1da177e4	325	* @q: queue statistics
64015853	326	* @qlen: queue length statistics
1da177e4 LT	327	*
1da177e4 LT	328	* Appends the queue statistics to the top level TLV created by
b0ab6f92 JF	329	* gnet_stats_start_copy(). Using per cpu queue statistics if
b0ab6f92 JF	330	* they are available.
1da177e4 LT	331	*
	332	* Returns 0 on success or -1 with the statistic lock released
	333	* if the room in the socket buffer was not sufficient.
	334	*/
	335	int
64015853	336	gnet_stats_copy_queue(struct gnet_dump *d,
b0ab6f92	337	struct gnet_stats_queue __percpu *cpu_q,
64015853	338	struct gnet_stats_queue *q, __u32 qlen)
1da177e4	339	{
b0ab6f92 JF	340	struct gnet_stats_queue qstats = {0};
	341
	342	__gnet_stats_copy_queue(&qstats, cpu_q, q, qlen);
64015853	343
1da177e4	344	if (d->compat_tc_stats) {
b0ab6f92 JF	345	d->tc_stats.drops = qstats.drops;
	346	d->tc_stats.qlen = qstats.qlen;
	347	d->tc_stats.backlog = qstats.backlog;
	348	d->tc_stats.overlimits = qstats.overlimits;
1da177e4 LT	349	}
	350
	351	if (d->tail)
b0ab6f92	352	return gnet_stats_copy(d, TCA_STATS_QUEUE,
9854518e ND	353	&qstats, sizeof(qstats),
9854518e ND	354	TCA_STATS_PAD);
1da177e4 LT	355
	356	return 0;
	357	}
9e34a5b5	358	EXPORT_SYMBOL(gnet_stats_copy_queue);
1da177e4 LT	359
	360	/**
	361	* gnet_stats_copy_app - copy application specific statistics into statistics TLV
	362	* @d: dumping handle
	363	* @st: application specific statistics data
	364	* @len: length of data
	365	*
e793c0f7	366	* Appends the application specific statistics to the top level TLV created by
1da177e4 LT	367	* gnet_stats_start_copy() and remembers the data for XSTATS if the dumping
	368	* handle is in backward compatibility mode.
	369	*
	370	* Returns 0 on success or -1 with the statistic lock released
	371	* if the room in the socket buffer was not sufficient.
	372	*/
	373	int
	374	gnet_stats_copy_app(struct gnet_dump d, void st, int len)
	375	{
	376	if (d->compat_xstats) {
1c4cff0c IG	377	d->xstats = kmemdup(st, len, GFP_ATOMIC);
	378	if (!d->xstats)
	379	goto err_out;
1da177e4 LT	380	d->xstats_len = len;
	381	}
	382
	383	if (d->tail)
9854518e ND	384	return gnet_stats_copy(d, TCA_STATS_APP, st, len,
9854518e ND	385	TCA_STATS_PAD);
1da177e4 LT	386
1da177e4 LT	387	return 0;
1c4cff0c IG	388
1c4cff0c IG	389	err_out:
edb09eb1 ED	390	if (d->lock)
edb09eb1 ED	391	spin_unlock_bh(d->lock);
1c4cff0c	392	d->xstats_len = 0;
1c4cff0c	393	return -1;
1da177e4	394	}
9e34a5b5	395	EXPORT_SYMBOL(gnet_stats_copy_app);
1da177e4 LT	396
	397	/**
	398	* gnet_stats_finish_copy - finish dumping procedure
	399	* @d: dumping handle
	400	*
	401	* Corrects the length of the top level TLV to include all TLVs added
	402	* by gnet_stats_copy_XXX() calls. Adds the backward compatibility TLVs
	403	* if gnet_stats_start_copy_compat() was used and releases the statistics
	404	* lock.
	405	*
	406	* Returns 0 on success or -1 with the statistic lock released
	407	* if the room in the socket buffer was not sufficient.
	408	*/
	409	int
	410	gnet_stats_finish_copy(struct gnet_dump *d)
	411	{
	412	if (d->tail)
1e90474c	413	d->tail->nla_len = skb_tail_pointer(d->skb) - (u8 *)d->tail;
1da177e4 LT	414
	415	if (d->compat_tc_stats)
	416	if (gnet_stats_copy(d, d->compat_tc_stats, &d->tc_stats,
9854518e	417	sizeof(d->tc_stats), d->padattr) < 0)
1da177e4 LT	418	return -1;
	419
	420	if (d->compat_xstats && d->xstats) {
	421	if (gnet_stats_copy(d, d->compat_xstats, d->xstats,
9854518e	422	d->xstats_len, d->padattr) < 0)
1da177e4 LT	423	return -1;
	424	}
	425
edb09eb1 ED	426	if (d->lock)
edb09eb1 ED	427	spin_unlock_bh(d->lock);
1c4cff0c IG	428	kfree(d->xstats);
	429	d->xstats = NULL;
	430	d->xstats_len = 0;
1da177e4 LT	431	return 0;
1da177e4 LT	432	}
1da177e4	433	EXPORT_SYMBOL(gnet_stats_finish_copy);